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3x - 2y = 8
eliminasi
6x + 9y = 3
6x - 4y = 16
_____________ ___
13 y = -13
y = -1
subtitusi
2x + 3(-1) = 1
2x -3 = 1
2x = 4
x = 2
Maka nilai dari x -2y = 2 - 2(-1) = 2 + 2 = 4